script en python para crear snapshots y rotarlos en AWS.
A continuación explicaré como crear snapshots en AWS usando un script en python, que a su vez rotará los snapshots, todo ello usando AWS cli en Linux.
Crear un cron que cree snapshots cada *:
[ec2-user@ip-10-5-0-143 ~]$ echo "* * * * * aws ec2 create-snapshot --volume-id vol-0b2efa7e024e758e5 2>&1 >> /tmp/cronlog" > cronjob
[ec2-user@ip-10-5-0-143 ~]$ crontab cronjob
Miramos qué snapshots existen en este momento:
[ec2-user@ip-10-5-0-143 ~]$ aws ec2 describe-snapshots --filters "Name=volume-id,Values=vol-0b2efa7e024e758e5"
{
"Snapshots": [
{
"Description": "",
"Encrypted": false,
"VolumeId": "vol-0b2efa7e024e758e5",
"State": "pending",
"VolumeSize": 8,
"StartTime": "2020-06-17T10:50:02.036Z",
"Progress": "99%",
"OwnerId": "077455710323",
"SnapshotId": "snap-0c9062daba8a9f4f7"
},
{
"Description": "",
"Encrypted": false,
"VolumeId": "vol-0b2efa7e024e758e5",
"State": "completed",
"VolumeSize": 8,
"StartTime": "2020-06-17T10:45:11.200Z",
"Progress": "100%",
"OwnerId": "077455710323",
"SnapshotId": "snap-0f2af28035ea778e5"
},
{
"Description": "",
"Encrypted": false,
"VolumeId": "vol-0b2efa7e024e758e5",
"State": "completed",
"VolumeSize": 8,
"StartTime": "2020-06-17T10:49:02.082Z",
"Progress": "100%",
"OwnerId": "077455710323",
"SnapshotId": "snap-0870e6eba7a6cc337"
}
]
}
Paramos crontab:
[ec2-user@ip-10-5-0-143 ~]$ crontab -r
Script para eliminar snapshots excepto 2:
[ec2-user@ip-10-5-0-143 ~]$ more snapshotter.py
#!/usr/bin/env python
import boto3
MAX_SNAPSHOTS = 2 # Number of snapshots to keep
# Create the EC2 resource
ec2 = boto3.resource('ec2')
# Get a list of all volumes
volume_iterator = ec2.volumes.all()
# Create a snapshot of each volume
for v in volume_iterator:
v.create_snapshot()
# Too many snapshots?
snapshots = list(v.snapshots.all())
if len(snapshots) > MAX_SNAPSHOTS:
# Delete oldest snapshots, but keep MAX_SNAPSHOTS available
snap_sorted = sorted([(s.id, s.start_time, s) for s in snapshots], key=lambd
a k: k[1])
for s in snap_sorted[:-MAX_SNAPSHOTS]:
print "Deleting snapshot", s[0]
s[2].delete()
Miramos cuantos snapshots hay:
[ec2-user@ip-10-5-0-143 ~]$ aws ec2 describe-snapshots --filters "Name=volume-id, Values=vol-0b2efa7e024e758e5" --query 'Snapshots[*].SnapshotId'
[
"snap-0c9062daba8a9f4f7",
"snap-0f2af28035ea778e5",
"snap-0870e6eba7a6cc337"
]
Ejecutamos el script:
[ec2-user@ip-10-5-0-143 ~]$ python snapshotter.py
Deleting snapshot snap-0f2af28035ea778e5
Deleting snapshot snap-0870e6eba7a6cc337
Miramos cuantos snapshos quedan:
[ec2-user@ip-10-5-0-143 ~]$ aws ec2 describe-snapshots --filters "Name=volume-id, Values=vol-0b2efa7e024e758e5" --query 'Snapshots[*].SnapshotId'
[
"snap-0c9062daba8a9f4f7",
"snap-0c87c81530f2f06c3"
]
Entradas
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